×

Alarm system and method for detecting proximity of an object to electrical power lines

  • US 4,675,664 A
  • Filed: 04/07/1986
  • Issued: 06/23/1987
  • Est. Priority Date: 10/26/1983
  • Status: Expired due to Term
First Claim
Patent Images

1. A system for detecting the proximity of an object to an alternating current power electrical line which creates a resulting electric field, said system comprising a receiver antenna device capable of receiving a current by capacitive effect and wherein the intensity of the current is a function of the distance separating the receiver antenna device from the said electrical line;

  • a measuring and conditioning circuit for converting the said received current to a coded signal, said measuring and conditioning circuit having a low input impedance with relation to a source impedance, whereby the influence of leakage through a supporting structure of the said receiver antenna is considerably reduced; and

    alarm means associated with said measuring and conditioning circuit to generate an alarm signal when the said coded signal reaches predetermined stored values.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×